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Oil is produced in the form of an oil emulsion due to the high depletion of deposits and significant water cut in wells. The formation of emulsions can lead to a number of complications in the operation of various field equipment, and sometimes even to emergency shutdowns or failures. Therefore, the study of the properties of demulsifiers and their effectiveness is an important task. The work investigates the surface-active properties of seven industrial demulsifiers produced in Russia, such as: interfacial and su...